bench bleeding, an w140 front wheels bearings
 

In my 50 years as my own mechanic, and machinist, I've replaced master cylinders but never bench bled them. Who does this.
anyone ever done w140 front wheel bearings. If pressed outer races look good why not just replace roller cages and inner races?

I've bench bled masters many times, it makes bleeding on the car a lot less hassle especially if you don't have a pressure bleeder.

I'd replace the races if for nothing else the peace of mind. It would probably be ok to reuse them if they look excellent; but, I wouldn't unless I had no other option.

I have found be such bleeding worthwhile in most cases. If you have a vise, it’s usually no big deal.

I always bench bleed them prior to install.

If the bearings and races look good I'd just clean, regrease, reset clearance and continue to run them.

I remember buying front hubs one time for the CD, hubs came with an outer bearing race (looked new) already installed.

If the bearings look good, just pack fresh grease and readjust them, if they are pitted or have bluish hue, replace the pairs complete with races, the races wear together with the rollers.